What Does It Mean When Field Quanta Are Not Spatially Localized?

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    Field Quanta
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Discussion Overview

The discussion revolves around the concept of field quanta and their spatial localization within the context of quantum field theory. Participants explore the implications of field quanta not being localized, questioning whether this relates to superposition, rapid movement, or the nature of virtual particles. The conversation touches on theoretical interpretations and the behavior of excitations in fields.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant asks if the non-localization of field quanta implies they are in superposition or moving very fast.
  • Another participant inquires whether field quanta are virtual particles that exist momentarily and seeks clarification on why they must be considered as part of the entire field system rather than localized excitations.
  • A different participant explains that in complex systems, excitations are often represented by normal modes, such as plane waves, suggesting that localized disturbances spread out over time.
  • Concerns are raised about the interpretation of field quanta being spread across the universe, as the field is omnipresent.
  • One participant expresses confusion about the nature of field quanta, questioning if a single quantum is indeed spread out everywhere rather than being localized at a point.

Areas of Agreement / Disagreement

Participants express varying degrees of confusion and curiosity regarding the concept of non-localized field quanta. There is no consensus on the implications of this non-localization, and multiple interpretations are presented without resolution.

Contextual Notes

Participants highlight limitations in understanding the nature of field quanta, including assumptions about localization, the behavior of excitations, and the implications of treating the field as a whole.

I2004
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what does it mean when someone says field quanta are not spatially localized?

does it mean they are in superpostion or they are just moving very fast?

sorry if I sound daft
 
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and are field quanta virtual particles that pop in and out of existence?

I read "field quanta are not spatially localized since they are not excition states at a certain point of the field but have to be assigned to the field system as whole"

can someone explain why they have to be assigned to the system as a whole?


please help...
 
Last edited:
When describing a complex system we try to use the excitations which are simplest, namely the normal modes. For a free field the normal modes are the plane waves. A disturbance that was initially localized would not stay that way, it would spread to neighboring points and be rather difficult to deal with!
 
what I don't get is when it says you must take into account the whole field.

like these field quanta spread across the whole universe, because the field is everywhere...
 
Last edited:
I just don't get it when he says they are not exition states at a point in the field.

what are they then? a single quantum is spread everywhere?

please help...
 

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